print(4 / 2)
print(int(4 / 2))
print(4 // 2)
print(int(2.222))
print(type(2.222))  # 获取类型
list1 = [[1, 'a'], [121, 1, 'p']]
print(list1)
print(len(list1))
print(len(list1[-1]))
tuple1 = tuple(list1)  # 元组
print(tuple1)
